Numbers k such that k prefixed by '4' and followed by '9' is prime.

Terms

a(0) =0a(1) =1a(2) =3a(3) =4a(4) =7a(5) =9a(6) =12a(7) =13a(8) =15a(9) =21a(10) =22a(11) =25a(12) =28a(13) =33a(14) =34a(15) =40a(16) =51a(17) =54a(18) =63a(19) =64a(20) =67a(21) =72a(22) =75a(23) =78a(24) =79a(25) =88a(26) =90a(27) =91a(28) =96a(29) =99